It really is simple. Rust zealotry is 100 percent fact and provable.
Ubuntu 25.10.
What is a foundational tenet of Linux? "We do not break user-space."
But, we do for Rust. Why? Because Rust MUST move forward at speed. Can't pass tests? Fuck it. Works good enough.
Breaks user-space? Yes, but not all the time and not for most people. We are accepting Rust CoreUtils for no other reason that it must be.
It has been decreed. Ubuntu about CoreUtils is Bill, "Fuck it, we'll do LIVE!".
Large performance hiccups, failing tests? Does not matter. Pushing it live will bring the issues to light and we can fix it all over time.
What? That is not how this has ever worked. We do not break user-space. Especially on purpose so we can speed up Rust development.
Rust replacements should exist. Rust replacements should make there way into the systems we are using every day to make things more secure. Rust replacements should work though and not break user-space. If is not an acceptable replacement if it were written in C, then it is not one just because it is written in Rust. Real commands, real scripts, real jobs fail. Anything that works as a drop in replacement should be accepted. (Preferably because it is provably better, not just, "Written in Rust though!". Anything that does not, should not be a default in the release and should stay in the background, getting better till it is ready.
Anything other than that is religious zeal, not making a better Linux.